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METHOD OF RECUPERATIVE PURIFICATION OF CADMIUM IONS FROM WASTE SOLUTIONS
METHOD OF RECUPERATIVE PURIFICATION OF CADMIUM IONS FROM WASTE SOLUTIONS
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机译:从废物溶液中净化纯化镉离子的方法
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摘要
The invention relates to a method of recuperative purification of waste aqueous solutions with a concentration of 35...1000 mg Cd/l for the recovery of cadmium ions. According to the invention, the method consists in treating waste solutions at a temperature of 80°C, while mechanically stirring for 15 min, with a solution of oxalic acid with a concentration of 1 N, in excess of 10...20%, at a pH of 5...5.7, followed by settling, filtering, washing with distilled water and drying at the ambient temperature the crystallized cadmium oxalate, which is further subjected to thermal decomposition at a temperature of 280...350°C to result in pure cadmium oxide, the recovery efficiency of the cadmium ions being of 97.75%.
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